Coil forming device



c. H. THORDARSON 1,904,890

COIL FORMING DEVICE Filed Feb. 12, 1931 April 18, 1933.

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INVENTOR BY M y y ATTORNEY;

Patented A r. 18, 1933 UNITED TRIO mmrrnorunine COMPANY, or ILLINOIS i onrcaeo, rumors, A; o'onrommon or f coIL romaine DEVICE I Application tau-awry 12,1931. Serial ifitffsisfisa This inventionrelatesto winding devices, and withparticularity to a hand ,tool for shaping wire during the winding operation.

An object of the invention is to provide an improved, simple hand tool for ,prebending wire that is to Joe-formed into a convoluted winding such asordiuarily used 1n transformers and other electrical units. In, the case of windings such as usedin transformers, electrical machines and other devices requiring ratherheavy wire, considerable difficulty is encountered in winding the coils uniformly and evenly. This is particularly true in the case of square or rectangular coils, since the wire'must bebent around relatively sharp corners; "This in itselfentails oonsiderabledilficulty 1n. the

winding operation and when the operation is performed by hand the repeated blnding and tensioning of the wire the hand. v

Accordingly it is another object of the present invention to provide a hand tool easily fatigues which. facilitates the bending and Winding of heavy wire into square,; rectangular or other similar shaped coils. 1 a

In the winding of coils with relatively heavy wire it has been" found in order that the winding when finished may present a substantially uniform flat surface, it is necessary not only tobend the wire around the corners of the coil form, but alsofto'give the portion of the Wire intermediate the corners an end bend so that when the wire is not actually bent around the corners of the coil form the intermediate portion does not become'bowed outwardly.

Accordingly it is another object of the present invention to provide a hand tool for enabling this corner bending and intermediate reverse bending of the wire to be accomplished expeditiously and easily by hand. y p

A feature of the invention relates to a hand tool for winding wire coils, which tool is provided with relatively simple means'for bending the wire at appropriate points and for subjecting the Wire to easily controlled tension. 1

. Other features and advantages not specifically enumerated will be apparent after aconsideration of the following detail description and the appended'claims."

Referring to the drawing r Fig. 1 shows atop plan view of a, coil winding tool accordin to the invention;

CHESTER. H. THORDARSON, or cmoAGo, ILLIitoIs, AssIeNoR 'ro 'rnonmmsoiw Fig-21s a rationalist Fi 'M akfii alongthe line 2 2 thereof; 7

Fig. 3 is section of Fig.2, taken .along the line 3+3 thereof.

Referring more particularly to the draw ing, the numeral 1 represents a 0011 form "of suitable material suchas fibre, wood, or other insulating material. While the drawing shows this form as square, itwill be understood that the invention is not limitedthere to, but may be applied to the winding of rectangularor even round coils. Y

The coil form 1 is mounted for rotation in asuitable rotating shaft represented inthe drawing by the numeral 2. Extending par allel to the shaft '2 is another shaft 3 upon which is slidably mounted the hand bend ing and tensioning tool-according'to thefinfvention. 1 Thls latter tool comprises around rod 4 having a'rectangu'lar slot 5 cut therein I and extending throughout the length therei of. The rod 4 terminates at itsleft'liaiid end 'in curved bifurcated portion 6;. in which are 'rotatably mounted the guide .rollers or pulleys 7 and 8 respectively. :iThe roller 7 is "designed of'such' a' diameter as to give the necessary bend to the wire" to con-1 form it" to the shapeof-the corners of the winding form 1., The rod 4 carryingthe pulleys? and 8 passes 'through'andis fastened to a block 9jby a setscrewlQ. The block 9 is adapted to rotateand slide on the shaft 3, and for-this 'purposefthe block S carries a cylindrical sleeve 11 to provide'an appropriate bearing on? the shaft 8. "Sn r rounding the right hand end ofthe rod lis V a ring 12 which may beheld on the rod by drive ted within the end of the ring 12 is a hard 14 ands straight.perforz 1tedv portion 15.

The bushing 13 heldwithin the sleeve I ring 12 by friction or drive fit:

Attached to ring 12 byscrew 16 is a metal tor any other suitable manner. Fit

rubber bushing13 having a taperedopening strip 17 which carries at its left hand end a strip or block of fibre 18. The fibre strip 18 may be attached to the member 17 in any suitable manner, for example the strip 18 is frictionally held in the slotted end of the arm 17 as shown clearly in the drawing. The

function of the member 18 is to provide a friction drag on the wire when the member 17 is depressed. v The member 17 and the friction member 18 are normally in the posi tion shownin Fig. 2, and the tool is adapted to be grasped with the fingers surrounding the rod portion 1 and the thumb-resting on the portion 18 of the member 17. At all times, therefore, the person using the tool I stop the feeding of the wire through the device. This drag causes the wire to be given a positive bend around the pulley 7 after which the attendant may release the pressure and allow the feeding movement to continue. Of course it will be understood that instead of stopping the wire the attendant may just increase the drag over that normally exerted. In any event the wireis bent at intervals of increased pressure around the pulley 7, while at the same time the wire is moving it is being given a slight reverse curve by passing beneath the pulley 8., It is this reverse curve which enables the coil to retain its flat surface after being wound and prevents the individual turns from bulging out wardly.

As a result of the manner of mounting the tool on the shaft 3, the attendant is enabled tofollow the feeding movement of the wire to advance it along the coil form as the latter rotates. There is thus provided a hand tool by which the tension and bending of the wire maybe easily effected during the winding of relatively heavy wire coils.

Various changes and modifications may be made without departing from the spirit and scope of the invention.

What is claimed is:

1. A hand tool for shaping and winding coils. comprising a handle portion through which wire is fed, adjustable means cooperating with said handle portion for exerting a frictional drag on said wire, and a pair of wire guiding rollers rotatably mounted in one end of the tool.

2. A tool according to claim 1 in which the frictional means is'mounted in the handle in a convenient position to be engaged by the thumb when the handle portion is naturally gripped.

3. A tool according to claim 1- in which the guide rollers are grooved and the tool terminates in a bifurcated portion in which the rollers are mounted. 4. A tool according to claim 1 in which one of the rollers serves to bend the wire at spaced intervals and the other roller serves to prevent the wire bulging outwardly between the first named bend portions.

5. A tool according to claim 1 in which one roller serves to make a bend 1n the wire in Y hand grip portion is longitudinally grooved to permitthe wire to be fed therethrough to said rollers.

8. In a hand tool for shaping and winding coils, means for guiding wire, means for bending said wire in one direction at regularly recurrent points to shape the coil, and means for bending the wire between said points in an opposite direction to prevent saipl wire bulging outwardly on the finished coi 9. Ahand tool for winding wire coils, comprising a hand grip portion, yieldable frictional means carried by said tool, and means carried by said tool for prebending the wire at regularly spaced intervals.

10. A hand tool according to claim 9 in which means are also provided for bowing the wire in the opposite direction to the pre bending thereof, to prevent bulging out wardly of the coil sides when formed.

In testimony whereof I have hereunto set my hand on this 9th day of February, A. D.

CHESTER H. THORDARSON. 

